US4904905A - Dual resonant frequency arc lamp power supply - Google Patents

Dual resonant frequency arc lamp power supply Download PDF

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Publication number
US4904905A
US4904905A US07/229,075 US22907588A US4904905A US 4904905 A US4904905 A US 4904905A US 22907588 A US22907588 A US 22907588A US 4904905 A US4904905 A US 4904905A
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United States
Prior art keywords
arc lamp
signal
frequency
voltage
terminals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/229,075
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English (en)
Inventor
Thomas E. Olon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Sterilizer Co
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American Sterilizer Co
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Publication date
Application filed by American Sterilizer Co filed Critical American Sterilizer Co
Priority to US07/229,075 priority Critical patent/US4904905A/en
Assigned to AMERICAN STERILIZER COMPANY, 2424 WEST 23RD STREET, ERIE, PA. 16514 A CORP. OF PA. reassignment AMERICAN STERILIZER COMPANY, 2424 WEST 23RD STREET, ERIE, PA. 16514 A CORP. OF PA. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OLON, THOMAS E.
Priority to PCT/US1989/003398 priority patent/WO1991002443A1/fr
Application granted granted Critical
Publication of US4904905A publication Critical patent/US4904905A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
    • H05B41/2883—Load circuits; Control thereof the control resulting from an action on the static converter the controlled element being a DC/AC converter in the final stage, e.g. by harmonic mode starting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the present invention is directed generally to health care lighting fixtures and, more specifically, to a dual resonant frequency power supply for a surgical room arc lamp.
  • Apparatus exist for starting and operating arc lamps used in a variety of applications. Because of the significantly different operating conditions exhibited by arc lamps between the start condition and the full run condition, present power supply apparatus for arc lamps incorporate a concept which involves combining separate devices for starting the lamp and operating the lamp in the full run condition. This concept involves providing a "starting" voltage signal of one magnitude and frequency for a predetermined period of time and then switching to a "running" voltage signal of another magnitude and frequency.
  • the apparatus of the present invention provides continuous current to the arc lamp and, therefore, does not require restart on each half-cycle as the alternating voltage passes through zero volts.
  • the dual resonance frequency circuit of the present invention also provides a near-unity power factor during both lamp “starting” and “running” conditions resulting in minimum circuit power losses and the ability to use passive cooling means, smaller lower-cost power transformers and smaller packaging size.
  • the automated frequency switchover from the "starting" to "running” condition eliminates arc lamp electrode degradation during virgin lamp starting or subsequent lamp starting by providing the appropriate power during the "starting" to “running” phase transitions.
  • the apparatus of the present invention provides pure sinusoidal voltages at ultrasonic frequencies which nearly eliminates EMI, a practical requirement in health care applications.
  • the present invention is directed to an apparatus for starting and operating an arc lamp used in health care applications.
  • the apparatus produces a rectangular wave AC signal with a frequency controlled by external resistive and capacitive networks.
  • An inductor and capacitor connected in parallel form a resonant circuit to receive the rectangular wave AC signal.
  • the series combination of an additional capacitor and the arc lamp is connected in parallel with the parallel inductor-capacitor combination.
  • Means are provided for detecting current flow in the arc lamp and for producing a voltage signal proportional to the detected current flow.
  • Switching means responsive to the current flow detection means function to switch a resistor into the resistive network controlling the frequency of the pulse-width modulated signal.
  • the apparatus of the present invention provides a power supply for an arc lamp used in health care applications which meets all of the requirements particular to this application such as low EMI and adaptability to 24 volt DC power sources.
  • FIG. 1 illustrates a circuit constructed according to the teachings of the present invention for starting and operating an arc lamp
  • FIG. 2 illustrates the details of a power MOSFET H-Bridge shown in FIG. 1;
  • FIG. 3 illustrates a circuit constructed to transform an AC line voltage into a regulated DC voltage
  • FIGS. 4A-4F illustrate various signals useful in explaining the operation of the circuit shown in FIG. 1.
  • FIG. 1 illustrates a circuit diagram for an apparatus 10 associated with a dual resonant frequency power supply of the present invention. Like reference numerals are employed among the various figures to designate like elements.
  • a pulse width modulator 12 has an input terminal 14 adapted to be connected with a source of DC voltage of predetermined magnitude.
  • One type of pulse width modulator 12 which may be used in the apparatus 10 of this invention is component SG2525AN available from Motorola Semiconductors.
  • the DC voltage is supplied by an arrangement well known in the art such as that depicted in FIG. 3.
  • FIG. 3 illustrates a circuit 50 required for transforming an AC line voltage into a regulated DC voltage.
  • the AC line voltage is applied across a primary winding of a step-down power transformer 52.
  • a low voltage AC signal available across the terminals of a secondary winding of the transformer 52 is connected across opposite terminals of a bridge rectifier 54.
  • the DC voltage at one of the remaining two terminals of the bridge rectifier 54 (with the fourth terminal being grounded) is filtered by filter 56 and then input to DC voltage regulator 58.
  • DC voltages of preselected values are available at the output terminals of DC voltage regulator 58.
  • a resistive network consisting of frequency control resistors R 1 , R 2 and R 3 is connected to terminal 24 of the pulse width modulator 12.
  • frequency control capacitor C 1 is connected to terminal 26.
  • a voltage V PWM available across terminals 28 and 30 of pulse width modulator 12 is applied across the terminals 32 and 34 of the primary winding of driver transformer 36.
  • the driver transformer 36 may have approximately 25 turns on the primary winding and 25 turns on each of the four secondary windings and, therefore, may have a turns ratio of 1:1 with respect to each of the secondary windings.
  • the outputs of transformer 36 available at secondary winding terminals 38, 39, 40, 41, 42, 43, 44 and 45 drive a H-Bridge 60 or its equivalent. Secondary winding terminals 38, 40, 43 and 45 have the same polarity.
  • FIG. 2 illustrates additional details of a MOSFET H-Bridge 60 which may be used for the H-Bridge 60 of FIG. 1.
  • the MOSFET H-Bridge 60 provides the high current driving capability which the pulse width modulator 12 does not possess.
  • a DC voltage source of predetermined magnitude, available at terminal 77, is applied to terminals 65 and 68 of MOSFETs 61 and 62, respectively.
  • One type of MOSFET which may be used in the apparatus 10 of the present invention is component MTM 50N05E available from Motorola Semiconductors.
  • Terminals 65 and 68 are commonly known in the art as the "drain.”
  • Terminals 67 and 70 of MOSFETs 61 and 62, respectively, commonly known in the art as the “source,” are connected to the drain terminals 71 and 74 of MOSFETs 63 and 64, respectively, at terminals 82 and 83.
  • the source terminals 73 and 76 of MOSFETs 63 and 64, respectively, are connected to ground.
  • Terminals 80 and 81 of the primary winding of a step-up transformer 84 are connected across terminals 82 and 83.
  • Transformer 36 terminal 38 is connected to MOSFET 61 terminal 66, commonly known in the art as the "gate,” while transformer 36 terminal 39 is connected to source terminal 67.
  • transformer 36 terminals 40 and 41 are connected to MOSFET 64 gate and source terminals 75 and 76, respectively
  • transformer 36 terminals 42 and 43 are connected to MOSFET 62 gate and source terminals 69 and 70, respectively
  • transformer 36 terminals 44 and 45 are connected to MOSFET 63 gate and source terminals 72 and 73, respectively.
  • a voltage signal V MHB is available across terminals 82 and 83.
  • Capacitor 85 and inductor 86 of FIG. 1 together act as a band-pass filter, eliminating voltage frequencies both above and below those of concern, and are connected in series between terminals 82 and 80.
  • Step-up transformer 84 has a low-impedance primary winding and may have a turns ratio of approximately 1:3.
  • the output terminals of the secondary winding are connected to the input low-turn tap 87 and the common tap 88 of tapped inductor 90.
  • Tapped inductor 90 provides a step-up capability of approximately 1:20.
  • the output tap 89 and common tap 88 are shunted by capacitor 92.
  • the parallel combination of tapped inductor 90 and capacitor 92 is further shunted by the series combination of capacitor 94, arc lamp 96 and current transformer 98.
  • Arc lamp 96 is of the type which produces current flow by vaporizing one of the rare earth metals such as mercury, sodium or cesium. Voltage signal V OUT is available across the output tap 89 and common tap 88 of tapped inductor 90.
  • Current transformer 98 is connected by terminals 99 and 100 on its primary winding in series with capacitor 94 and arc lamp 96 and by terminals 101 and 102 on its secondary winding across resistor 103 to ground.
  • Current transformer 98 may have a turns ratio of approximately 1:50.
  • the anode of diode 104 is connected to the secondary winding terminal 101 while the cathode is connected to one end of a parallel combination of a capacitor 106 and resistor 108, the other end of the parallel combination being tied to ground.
  • the diode 104, capacitor 106 and resistor 108 combination performs the function of a half-wave rectifier and filter.
  • One type of diode 104 which may be used in the apparatus 10 of this invention is component 1N914 available from Motorola Semiconductors.
  • the DC voltage at the output of the half-wave rectifier and filter is input to the base terminal 110 of transistor 112 through current limiting resistor 111.
  • the emitter terminal 113 of transistor 112 is tied to ground while the collector terminal 114 is connected through load resistor 121 to a DC voltage source.
  • Collector terminal 114 of transistor 112 is also connected through voltage divider resistors 115 and 116 to the base terminal 117 of transistor 118.
  • the emitter terminal 119 of transistor 118 is tied to ground while the collector terminal 120 is connected between resistors R 2 and R 3 .
  • One type of transistor which may be used for either transistor 112 or 118 is component 2N3904 available from Motorola Semiconductors.
  • the current transformer 98, transistor 118 and associated components act as a feedback path for detecting current flow through the arc lamp 96 which determines whether resistor R 3 is in or out of the circuit.
  • resistor R 3 determines whether resistor R 3 is in or out of the circuit.
  • transistor 118 is initially forward biased so that resistor R 3 is shorted to ground.
  • the resistive network at terminal 24 of pulse width modulator 12 therefore, consists of resistors R 1 and R 2 .
  • the voltage V PWM available across terminals 28 and 30 of the pulse width modulator 12, can be represented by the signal of FIG. 4A.
  • the signal frequency can be represented by the equation
  • the signal magnitude is equal to the magnitude of the DC voltage applied at input terminal 14 of pulse width modulator 12.
  • Voltage signal V MHB available across terminals 82 and 83 of MOSFET H-Bridge 60 can be represented by the trace of FIG. 4B.
  • the frequency of voltage signal V MHB is equal to that of voltage signal V PWM while the magnitude of the signal is equal to the root-mean-square value of the DC input voltage available at terminal 77.
  • the arc lamp 96 exhibits a very high impedance and functions to open the circuit of the series combination of capacitor 94, arc lamp 96 and current transformer 98.
  • Tapped inductor 90 and capacitor 92 thus, form a parallel-resonant L-C circuit.
  • the resonant frequency of this circuit can be represented by the following equation: ##EQU1## where L equals the inductance of tapped inductor 90 and C equals the capacitance of capacitor 92.
  • L and C are chosen for proper lamp operation, while R 1 , R 2 and C 1 (inputs to pulse width modulator 12) are chosen such that the frequency of voltage signal V PWM at the output of pulse width modulator 12 is equal to the resonant frequency of the L-C Circuit.
  • Voltage signal V OUT can be represented under lamp start conditions by the signal illustrated in FIG. 4C.
  • V OUT has a frequency equal to both the resonant frequency of the L-C circuit and the frequency of voltage V PWM and a root-mean-square magnitude in the kilovolt range.
  • Transistor 112 now becomes forward biased, current begins to flow in collector terminal 114 and transistor 118 is in cutoff.
  • the zero current flow in collector terminal 120 functions to place resistor R 3 into the resistive network coupled to terminal 24 of pulse width modulator 12.
  • the voltage V PWM now available across terminals 28 and 30 of the pulse width modulator 12 can be represented by the signal of FIG. 4D.
  • the signal frequency can now be represented by the equation
  • the signal magnitude is still equal to the magnitude of the DC voltage applied at input terminal 14 of pulse width modulator 12.
  • Voltage signal V MHB across terminals 82 and 83 of MOSFET H-Bridge 60 can now be represented by the trace of FIG. 4E.
  • the frequency of voltage signal V MHB is equal to that of voltage signal V PWM while the magnitude of the signal is equal to the root-mean-square value of the DC input voltage available at terminal 77.
  • V OUT now has a frequency equal to both the new resonant frequency of the L-C circuit combination and the new frequency of voltage V PWM and a root-mean-square magnitude in the kilovolt range approximately one-half that of the magnitude of V OUT under lamp start conditions.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
US07/229,075 1988-08-05 1988-08-05 Dual resonant frequency arc lamp power supply Expired - Fee Related US4904905A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07/229,075 US4904905A (en) 1988-08-05 1988-08-05 Dual resonant frequency arc lamp power supply
PCT/US1989/003398 WO1991002443A1 (fr) 1988-08-05 1989-08-08 Alimentation electrique a double frequence de resonance pour lampe a arc

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US07/229,075 US4904905A (en) 1988-08-05 1988-08-05 Dual resonant frequency arc lamp power supply

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435228A2 (fr) * 1989-12-29 1991-07-03 Zumtobel Aktiengesellschaft Circuit et procédé pour alimenter (et amorcer) une lampe à décharge
US5083065A (en) * 1989-10-23 1992-01-21 Nissan Motor Co., Ltd. Lighting device for electric discharge lamp
US5175475A (en) * 1989-11-29 1992-12-29 Gte Products Corporation High-pass t-networks with integral transformer for gaseous discharge lamps
US5235254A (en) * 1990-04-23 1993-08-10 Pi Electronics Pte. Ltd. Fluorescent lamp supply circuit
EP0577105A1 (fr) * 1992-06-30 1994-01-05 Toshiba Lighting & Technology Corporation Circuit onduleur et appareil d'éclairage pour lampe à décharge sans electrodes utilisant un tel circuit onduleur
EP0649271A1 (fr) * 1993-10-18 1995-04-19 General Electric Company Ballast électronique pour lampe à halogénure métallique
DE4425679A1 (de) * 1994-02-15 1995-08-17 Matsushita Electric Works Ltd Vorrichtung zum Betreiben einer Hochdruck-Gasentladungslampe
DE4425890A1 (de) * 1994-07-11 1996-01-18 Priamos Licht Ind & Dienstleis Schaltungsanordnung für den Betrieb einer Entladungslampe
WO1996038024A1 (fr) * 1995-05-26 1996-11-28 Jon Paul Ballast electronique de haute efficacite
EP0763759A2 (fr) * 1995-09-14 1997-03-19 Sumitomo Electric Industries, Inc. Méthode et appareil de décharge électrique
DE19608658C1 (de) * 1996-03-06 1997-05-07 Bosch Gmbh Robert Schaltungsanordnung zum Zünden und Betreiben einer Hochdruckgasentladungslampe
EP0794694A1 (fr) * 1996-03-06 1997-09-10 Robert Bosch Gmbh Circuit pour alimenter une lampe à haute pression
DE19608655A1 (de) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Leistungssteuerung einer mit Wechselstrom betriebenen Hochdruckgasentladungslampe, insbesondere für Kraftfahrzeuge
US5691607A (en) * 1996-04-26 1997-11-25 Northrop Grumman Corporation Modular high power modulator
GB2319677A (en) * 1996-11-19 1998-05-27 Micro Tech Ltd Discharge lamp starting and operating circuit
EP0701389A3 (fr) * 1990-12-07 1998-08-26 Tridonic Bauelemente GmbH Circuit pour commander l'intensité lumineuse et le mode de functionnement de lampes à décharge
USRE35994E (en) * 1992-07-06 1998-12-15 Icecap, Inc. Variable control, current sensing ballast
EP1321013A1 (fr) * 2000-07-21 2003-06-25 Osram Sylvania, Inc. Procede et appareil de detection a l'arc et de protection de regulateurs electroniques
WO2008065383A1 (fr) * 2006-11-27 2008-06-05 Charles Daniel Inverseurs
WO2009059744A1 (fr) * 2007-11-05 2009-05-14 Tridonicatco Gmbh & Co. Kg Ballast pour lampe à décharge, par exemple pour une lampe dhi
US20090206674A1 (en) * 2005-07-19 2009-08-20 Olympus Medical Systems Corp. Medical instrument storage system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346273B (en) * 1999-01-20 2003-10-29 Nordson Corp Power supply including a lamp ignitor circuit
DE102007052669B4 (de) * 2007-11-05 2023-09-07 Tridonic Gmbh & Co Kg Vorschaltgerät für eine Gasentladungslampe, bspw. eine HID-Lampe

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US4277728A (en) * 1978-05-08 1981-07-07 Stevens Luminoptics Power supply for a high intensity discharge or fluorescent lamp
US4525650A (en) * 1982-02-11 1985-06-25 North American Philips Lighting Corporation Starting and operating method and apparatus for discharge lamps
US4698554A (en) * 1983-01-03 1987-10-06 North American Philips Corporation Variable frequency current control device for discharge lamps
US4700113A (en) * 1981-12-28 1987-10-13 North American Philips Corporation Variable high frequency ballast circuit
US4700111A (en) * 1986-07-28 1987-10-13 Intelite Inc. High frequency ballast circuit

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DE2426481A1 (de) * 1974-05-31 1975-12-11 Braun Ag Starterlose schaltungsanordnung zum betrieb von leuchtstofflampen
DE2934942A1 (de) * 1979-08-29 1981-04-02 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zum zuenden und betrieb einer gasentladungsroehre
GB8625329D0 (en) * 1986-10-22 1986-11-26 Valor Int Ltd Control gear for gas discharge lighting

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US4277728A (en) * 1978-05-08 1981-07-07 Stevens Luminoptics Power supply for a high intensity discharge or fluorescent lamp
US4700113A (en) * 1981-12-28 1987-10-13 North American Philips Corporation Variable high frequency ballast circuit
US4525650A (en) * 1982-02-11 1985-06-25 North American Philips Lighting Corporation Starting and operating method and apparatus for discharge lamps
US4698554A (en) * 1983-01-03 1987-10-06 North American Philips Corporation Variable frequency current control device for discharge lamps
US4700111A (en) * 1986-07-28 1987-10-13 Intelite Inc. High frequency ballast circuit

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Title
Lester and Cohen, "The RF Starter and its Application to Miniature Metal Halide Lamps", Journal of the Illuminating Engineering Society (1986).
Lester and Cohen, The RF Starter and its Application to Miniature Metal Halide Lamps , Journal of the Illuminating Engineering Society (1986). *

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083065A (en) * 1989-10-23 1992-01-21 Nissan Motor Co., Ltd. Lighting device for electric discharge lamp
US5175475A (en) * 1989-11-29 1992-12-29 Gte Products Corporation High-pass t-networks with integral transformer for gaseous discharge lamps
EP0435228A3 (en) * 1989-12-29 1992-07-08 Zumtobel Aktiengesellschaft Circuit and process for operating (and igniting) a discharge lamp
EP0435228A2 (fr) * 1989-12-29 1991-07-03 Zumtobel Aktiengesellschaft Circuit et procédé pour alimenter (et amorcer) une lampe à décharge
US5235254A (en) * 1990-04-23 1993-08-10 Pi Electronics Pte. Ltd. Fluorescent lamp supply circuit
EP0701389A3 (fr) * 1990-12-07 1998-08-26 Tridonic Bauelemente GmbH Circuit pour commander l'intensité lumineuse et le mode de functionnement de lampes à décharge
EP0577105A1 (fr) * 1992-06-30 1994-01-05 Toshiba Lighting & Technology Corporation Circuit onduleur et appareil d'éclairage pour lampe à décharge sans electrodes utilisant un tel circuit onduleur
USRE35994E (en) * 1992-07-06 1998-12-15 Icecap, Inc. Variable control, current sensing ballast
EP0649271A1 (fr) * 1993-10-18 1995-04-19 General Electric Company Ballast électronique pour lampe à halogénure métallique
DE4425679A1 (de) * 1994-02-15 1995-08-17 Matsushita Electric Works Ltd Vorrichtung zum Betreiben einer Hochdruck-Gasentladungslampe
DE4425679C2 (de) * 1994-02-15 2001-07-05 Matsushita Electric Works Ltd Vorrichtung zum Zünden und Betreiben einer Hochdruck-Gasentladungslampe
DE4425890A1 (de) * 1994-07-11 1996-01-18 Priamos Licht Ind & Dienstleis Schaltungsanordnung für den Betrieb einer Entladungslampe
US5677602A (en) * 1995-05-26 1997-10-14 Paul; Jon D. High efficiency electronic ballast for high intensity discharge lamps
WO1996038024A1 (fr) * 1995-05-26 1996-11-28 Jon Paul Ballast electronique de haute efficacite
EP0763759A3 (fr) * 1995-09-14 1997-09-17 Sumitomo Electric Industries Méthode et appareil de décharge électrique
US5777867A (en) * 1995-09-14 1998-07-07 Suitomo Electric Industries, Ltd. Electric discharge method and apparatus
EP0763759A2 (fr) * 1995-09-14 1997-03-19 Sumitomo Electric Industries, Inc. Méthode et appareil de décharge électrique
DE19608658C1 (de) * 1996-03-06 1997-05-07 Bosch Gmbh Robert Schaltungsanordnung zum Zünden und Betreiben einer Hochdruckgasentladungslampe
DE19608655A1 (de) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Leistungssteuerung einer mit Wechselstrom betriebenen Hochdruckgasentladungslampe, insbesondere für Kraftfahrzeuge
EP0794694A1 (fr) * 1996-03-06 1997-09-10 Robert Bosch Gmbh Circuit pour alimenter une lampe à haute pression
US5945787A (en) * 1996-03-06 1999-08-31 Robert Bosch Gmbh Power control of an AC-operated high-pressure gas discharge lamp, particularly for motor vehicles
DE19608656A1 (de) * 1996-03-06 1997-09-11 Bosch Gmbh Robert Schaltungsanordnung zum Betrieb einer Hochdruckgasentladungslampe
US5691607A (en) * 1996-04-26 1997-11-25 Northrop Grumman Corporation Modular high power modulator
GB2319677A (en) * 1996-11-19 1998-05-27 Micro Tech Ltd Discharge lamp starting and operating circuit
GB2319677B (en) * 1996-11-19 2001-04-18 Micro Tech Ltd Lamp driver circuit and method
EP1321013A1 (fr) * 2000-07-21 2003-06-25 Osram Sylvania, Inc. Procede et appareil de detection a l'arc et de protection de regulateurs electroniques
EP1321013A4 (fr) * 2000-07-21 2003-10-01 Osram Sylvania Inc Procede et appareil de detection a l'arc et de protection de regulateurs electroniques
US20090206674A1 (en) * 2005-07-19 2009-08-20 Olympus Medical Systems Corp. Medical instrument storage system
WO2008065383A1 (fr) * 2006-11-27 2008-06-05 Charles Daniel Inverseurs
WO2009059744A1 (fr) * 2007-11-05 2009-05-14 Tridonicatco Gmbh & Co. Kg Ballast pour lampe à décharge, par exemple pour une lampe dhi

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